In the figure, a 1.6-kg weight swings in a vertical circle at the end of a string having negligible weight. The string is 2 m long. If the weight is released with zero initial velocity from a horizontal position, its angular momentum (in kg?m2/s) at the lowest point of its path relative to the center of the circle is approximately
a.
40
b.
10
c.
30
d.
20
e.
50
d
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What can we conclude about the structure of Earth's interior knowing that the average density of Earth is higher than the average density of the rock on the continents and seafloor?
A) That Earth's most dense material must be water B) That Earth's most dense material must be the seafloor and the continents C) That Earth's most dense material must be beneath the surface D) That Earth's least dense material must be the seafloor and the continents E) That Earth's least dense material must be beneath the surface
Explosions could be common in reactors were they not computer-controlled
What will be an ideal response?
Plane polarized light is sent through two consecutive polarizers, the first having its plane of polarization in the same direction as the incident light and the second having its plane at 90° to the original plane of polarization. A third polarizer, with plane of polarization at 60° to the original plane of polarization, is placed between the two other polarizers. What fraction of the original
intensity now gets through? a. 0.56 c. 0 b. 0.19 d. 0.25
An RLC series circuit has a 200 
resistance, a 3.00 mH inductor, and a 100 ?F capacitor. What is the resonant frequency for this circuit?
A. 1.80 kHz B. 1.80 MHz C. 290 Hz D. 290 kHz E. 11.0 kHz